Python Tools for Visual Studio - tell the IDE what type a parameter will be

I just started using Visual Studio 2015, and I really like it, especially the code completion features. Right now I'm writing some simple Python code to draw an object on a Tkinter Canvas:

def draw(self, can):
""" can is a Tkinter canvas on which this node will draw itself. """
can.<something>

This being Python, nowhere in the actual code is it indicated that "can" is going to be a Canvas, so VS can't autocomplete or suggest anything after I type "can." Is there a way I can tell Visual Studio that can will be of type tkinter.Canvas?